1823.] Scientific Notices — Chemistry. 313 



Mr. E. A. Lloyd delivered the Annual Oration. The subject 

 was, the " Constitutional Treatment of Organic Diseases." 

 The Fellows and their friends then dined together at the London 

 Tavern, Ludgate Hill. 



In conformity with the will of the late Dr. Anthony Fother- 

 gill, the Society offers the annual gold medal, value 20 guineas, 

 for the best dissertation on a subject proposed by them, for 

 which prize the learned of all countries are invited as candidates. 



The subject for this year is " The Nature and Treatment of 

 Carcinoma." 



1. Each dissertation must be dehvered to the Registrar in the 

 Latin or Enghsh language, on or before the 1st of December. 



2. With it must be dehvered a sealed packet with some motto 

 or device on the outside, and within the author's name and 

 designation, and the same motto or device must be put on the 

 dissertation, that the Society may know how to address the 

 successful candidate. 



3. No paper in the handwriting of the author, or with bis 

 name affixed, can be received ; and if the author of any paper 

 shall either directly or indirectly discover himself to the Com- 

 mittee of Papers, or any member thereof, such paper will be 

 excluded from all competition for the medal. 



4. The prize medal will be presented to the successful candi- 

 date, or his substitute, at the Anniversary Meeting of the Society 

 in March, 1826. 



5. All the dissertations, the successful one excepted, will be 

 returned, if desired, with the sealed packet, unopened. 



*^* The subject of the dissertation for the year 1826-7 is 

 " Contagion and Infection." 



Medical Society^ s House, Bolt-court, Fleet-street, 

 March 17, 18'25. 



Article XII. 



SCIENTIFIC NOTICES. 



Chemistry. 



1 . Condensation of a Mixture of Hydrogen and Oxygen hy pul- 

 verulent Platinum. 



Dobereiner has ascertained that moist as well as dry platinum 

 causes the mutual condensation of these two gases. The effect 

 in both cases is equally complete; the only difference being in 

 the length of time necessary to produce it. 



The best method of performing the experiment is to ignite at 

 the bottom of a glass tube closed by fusion at one extremity, a 

 Quantity of the double ammonio-muriate of platinum, or to 

 decompose in it a solution of platinum by means of a rod of zinc. 



